Slope and Pitch Problems on the Roofing Contractor's Test
Slope, in roofing, is expressed or the rise (in inches) per 12 inches of run. For example, in the diagram below, we have a slope of 6 in 12. Why? Because the rise every 12” is 6” of the run. In other words, it rises half as fast as it runs.
Note: We get 1/3 by dividing both 12 and 36 into 12.
How to convert from Pitch to Slope
- Multiply the Pitch times 2
- Multiply both numerator and denominator by the only number that allows the denominator (bottom number in a factor) to get to 12
For example: Convert a pitch of 1/4 to slope
- 1/4 x 2 = 1/2
- 1/2 x 6/6 = 6/12 => 6 in 12 is the slope equivalent to a pitch